Injector



(Model.)

W. B. MACK. INJEGI'OR.

No. 457,514. Patented Aug. 11, 1891.

PATENT OFFICE.

VILLIAM B. MACK, OF BOSTON, MASSACHUSETTS.

INJE

SPECIFICATION forming part of Letters CTOR.

Patent No. 457,514, dated August 11, 1891.

Application filed March ll, 1891. Serial No. 384.540. (Model.)

To all whom it may concern:

Be it known that I, WILLIAM B. MACK, of Boston, in the county of Suolkand State of Massachusetts, have invented certain new and usefulImprovements in Injectors, of which the following is a specification.

This invention relates to boiler-feeding injectorslin which thecombining-tube of the injector which receives the current of mingledsteam and water is surrounded by a water-space communicating with theinterior of said tube and with an overflow-nozzle.

The invention has for its chief object to provide certain improvementsin the construction of the injector, whereby access to said space forthe purpose of removing deposits of lime or other foreign mattertherefrom will be made more feasible; and it consists in theimprovements which I will now proceed to describe and claim.

Of the accompanying drawings, forming a part of this specification,Figure l represents a longitudinal section of an injector embodying myimprovements. Figs. 2 and 3 represent side views of the combining anddelivery tubes of the injector, said tubes being separated.

The same letters and numerals of reference indicate the same parts inall the figures.

In the drawings, arepresents the casing of the injector, and brepresents the combiningtube located within said casing and having anenlarged inner end which receives the cone c, around which the waterenters said combining-tube and through which the steamnozzle cl passesinto the combining-tube.

t' represents the delivery-tube, which constitutesa continuation of thecombining-tube.

My present invention relates entirely to the construction of thecombining and delivery tubes and to the mode of their application to thecasing of the injector, the injector being in all other respectssubstantially the same as the well-known Mack injector, although I donot desire to be understood as limiting myself in my improvements,hereinafter described, to this particular style of injector, but mayapply said improvements to any other injector to which they areapplicable.

The combining-tube b is provided at its inner and larger end with anarrow outwardlyprojecting flange or lip b', which is of smallerdiameter than the internally-screw-threaded openingf, into which thecone c is screwed, so'that the portion of the combining-tube on throughsaid opening before the steam-cone is applied. The flange b has abearing on a shoulder a formed within the casing, said shoulder'supporting the ange and preventing the combining-tube, on which it isformed, from moving toward the delivering end of the injector-casing.

The combining and delivery tubes are detachably united by a screw-threadconnection, one member of which is an external thread 4, formed on thecombining-tube, while the other is an internal thread formed Within thedelivery-tube. The delivery-tube has at its outer end a head orenlargement h, which is adapted to rotate in a chamber g, formed in thedelivery-tube nut or terminal i', which is screwed into one end of thecasing, said nut c" having an internal shoulder t2, which constitutesabearing for the inner side ot' the head 7L. Said head h is provided withorices 7L h to enable it to be engaged by a Spanner, whereby thedelivery-tube may be rotated to engage it with or remove it from thecombining-tube.

From the foregoing it will be seen that the combining and delivery tubesare inserted to place from opposite ends of the casing, thecombining-tube being inserted from one end and the delivery-tube fromthe opposite end. The said tubes are united within the casing byscrewing their threaded ends together, this being accomplished byrotating the deliverytube by means of its head h until the flange b ofthe combining-tube comes to a firm bearing on the shoulder a of thecasing. It will be observed that the delivery-tube has no screw-threadconnection with the nut t" and is free to rotate independently in saidnut. This fact enables the delivery-tube to be readily unscrewed fromthe combining-tube and withdrawn from the casing whenever it is desiredto obtain access to the space 5, surrounding the combining-tube.

It often happens that when the water forced by the injector contains aconsiderable percentage of lime solid accumulations of this which saidflange is formed may be passed material will form in the space 5 to suchan extent as to fill the same and obstruct the overflow-outlet 6. Thisaccumulation is of a very rigid nature, and therefore makes it dit'-icult, if not impossible,'to remove the combining-tube, the main portionof said tube being surrounded and embedded in said deposit. Heretoforethe delivery-tube has been so constructed and applied to the casing thatit can only be removed With the combining-tube. Hence access tothe space5 for the purpose of removing said deposits is oftentimes a matter ofgreat diiiiculty.

It will be seen that my improvement, which comprehends the making of thedelivery-tube independently removable, enables said delivery-tube, whichpresents but a small surface to the space 5 and is so located as to bebeyond the area or portion of said space in which the principalaccumulation of lime occurs, to be readily removed, so that free accesscan be had to the space 5 for the purpose of removing the deposits oflime therein, either bythe introduction ot' a suitable acid orotherwise. My invention therefore obviates all difficulty concerning theremoval of deposits from the space 5, thus making it easT to keep theinjector in good Working order and reducing the liability of permanentdisability of the injector.

I claim- In an injector, the combination of the casing having aninternal shoulder a', the shouldel-ed terminal or nut i', engaged withone end of the casing and provided with an internal shoulder 2, thecombining and delivery tubes detachably united at their meeting ends bya screw-thread connection, the inner end of said combining-tube having aflange b formed to bear on the shoulder a of the casing and the outerend of the delivery-tube, and a head h, formed to bear on the shoulder 2of the nut, the said delivery-tube being independently rotatable andadapted to be engaged by a tool, whereby the delivery-tube may berotated to engage it with or remove it from the combining-tube, as setforth.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing Witnesses, this 3d yday of March, A. D.1891. I

XVILLIAM B. MACK.

Witnesses:

` WM. B. MACK, J r.,

C. F. BROWN.

